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Jon Hamm is an American actor known for his role of Don Draper on the hit series Mad Men. Jon Hamm is also a term of reference for a man with a large penis.
Me: Did you hear Jon Hamm won an Oscar?
Guy: Yeah, Jon Hamm is such a good actor, Mad Men is the best!

Penal use:
Chick: I thought he was going to have a Jon Hamm but actually he had a Non Hamm.
Friend: That's so dissapointing. I love Jon Hamms.
by The real rj December 10, 2013
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